i just +1ed it. So don't wonder it got more than just half of the rep points of the Q. Nice comment from scott :)
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kaiser♦Mar 30 '11 at 12:22

Very helpful, Jan. Follow-up question: how do you get access to the current post's data inside on_bulk_edit_custom_box in order to prepopulate fields? global $post doesn't seem to work.
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GeertOct 19 '11 at 7:28

The above answers don't provide a definite means to save data. The following code comes out of a production system using the video custom post type before I wrote the the WordPress bulk edit plugin Custom Bulk/Quick Edit.